板坯连铸工艺参数对取向硅钢铸坯中心等轴晶率的影响

通过对取向硅钢铸坯的低倍检验,研究了中间包钢水过热度、电磁搅拌电流、二冷水强度、拉速及断面尺寸对铸坯中心等轴晶率的影响。结果表明,试验条件下,中间包钢水过热度控制在14~18 ℃范围内时,因过热度不同引起的中心等轴晶率的变化较小,变化范围仅为0%~3%;电磁搅拌电流和铸坯断面尺寸对中心等轴晶率的影响较为明显,随搅拌电流的增大,中心等轴晶率呈增加的趋势,而当铸坯断面尺寸增加时其呈减小的趋势;二冷水强度和拉速对中心等轴晶率的影响相对较小,随着二冷水强度的增大,中心等轴晶率呈减小的趋势,而当拉速提高时其呈增加的趋势。

Effects of continuous casting process parameters on central equiaxed crystal ratio of oriented silicon steel slab

The effects of the superheat of the steel in tundish, electromagnetic stirring current, secondary cooling intensity, casting speed and sectional dimension on the central equiaxed crystal ratio were investigated through the macro examination of oriented silicon steel slab. The results showed that under the test conditions, when the superheat of the steel in tundish was controlled within the range of 14-18 ℃, the change of the central equiaxed crystal ratio caused by the difference of the superheat was small, and the variation range was only 0%-3%. The influence of the electromagnetic stirring current and the sectional dimension of the slab on the central equiaxed crystal ratio was obvious. With the increase of the stirring current, the central equiaxed crystal ratio increased, and it decreased when the sectional dimension of the slab increased. The influence of the secondary cooling intensity and casting speed on the central equiaxed crystal ratio was relatively small. With the increase of the secondary cooling intensity, the central equiaxed crystal ratio decreased, and it increased when the casting speed increased.